Adding-machine.



J. BRICKEN.

ADDING MACHINE.

1'. BRICKEN;

ADDING MACHINE. Y APPLICATION FILED-Nov. l1. 19,16A

Patented sept.- 3,1918. 8 SHEETS-SHEET 2 INVENTOR WITNESSES"` A ATTORNEYS J. BRICKEN.

ADDING MACHINE. APPLICATION F-LED NOV. I7. 19.1.6, 1

Patented Sept. 3,19185:

a SHEETS-SHEET 3.

i m22 55 .E 26- P, n. i. y y 2 1%21 ATTORNEYS I. BmcKEN. ADDING MACHINE. APPLICATION/ULEB NOV. I7. 1916.

1,277,692. pafentedsept. 3,1m

8 SHEETS-SHEET 5.

J. BHICKEN.

ADDING MACHINE.

APPLICATION HLEDNov..11.19xs,

P2-Hemd Sept, 3, 1918L 8 SHEETS-suffi s.

WITNESSES ATTORNEYS 1. BHICKEN ADDING MACHINE.

APPLICATION FILED NOV. l?. I9I6.

fig/6? WITNESSES MM W M;

Patented sept. 3,1918.

8 SHEETS-SHEET 7.

' i. BRICKEN. ADDING'MACHINE.

APPLICATION FIL'ED NV- I7. 19|6.

Patented Sept. 3,1918,

8 SHEETS-SHEET 8.

w. m v W W .A VWM@ UNITED STATES PATENT FFICE.V

JOHN BRICKEN, OF DETROIT, MICHIGAN, ASSIGNOR T0 BURROUGHS ADDING IVICHINE COMPANY, OF DETROIT, IVIICHIGAN, A CORPORATION GF MICHIGAN.

ADDING-MACHINE.

Application filed November i7, 1916.

To all whom t may concern.'

Be it known that I, J onN Bereken, a subject of the Emperor of Russia, residingat Detroit, in the count-y of Wayne. and State of Michigan, have invented certain new and usefull Improvements in Adding-Machines, of which the following is a specification.

The invention relates to an improved machine for adding and subtracting in which members, each having` a numeral, from 0 to S) inclusive, are substituted at the sight opening one for another, instead of the number being made to appear at the sight by the conunon form of numeral wheel having numbers disposed about its periphery. As here shown, registering levers have offset plates at their upper ends one above the other, the 0 plate being the lower one and 9 the upper. The lower ends of these levers are pivotally connected to actuator bars or plates of which there are ten for each order, one of which is always forward with its associated number appearing at the sight.. Each of these actuater bars in all orders but units is provided with ten controlpins, the pins on the forward bar controlling staggered bell crank levers'which set up one ot' ten ahutments'on each of the other bars, said abutments when in raised or operating position, being in the path of a universal pawl, of which there is one for each numeral key, and an additional pawl for effecting the carry. Depression of a numeral key opcrates its pawl to engage the abutment .in its path and push the selector bar to which it is attached, forward, and rock the associated lever to cause its number to appear at the sight. Simultaneously, the bar previously forward is released and returns to its real-most position under spring tension to remove its numbers from the sight and permit the, number of the now advanced bar to appear at the sight. A universal locking bar for each order, including units, locks the advanced bar in its forward position until a cam on the under side of the bar next advanced. rocks the universal lock bar to release the forward bar and permit it to re-` turn` and locks the. advanced bar in forward position.

The sta ggered bell cranks are arranged on shaftsin tiers4 under the selector bars in or der to avoid interference with each other.

In Order tc understand the invention, it

Specification o Letters Fatent.

Patented Sept. 3, 1918.,

Serial No. 131,943.

must be borne in mind that the pins and bell crank levers of the selector bar which is forward in all the orders, always control the setting up or' one abutment on each bar i this order. p

In the units order, the tent-h or carrying bank is omitted; as there would be no carryinto the units order from a` lower order.

The abutments which have been projected into the path of the universal pawl by the bar which is forward, are controlled as follows:

rlhe O bar being forward, its nine pins operate associated bell cranks to set up one abutment on each of the bars 1 to 9 inclu` sive.-

lst pin aises abut-ment for l key on 1 bar H (C l( LC 2 C( C" 2 L i C C (C 3 (C t L and so on to the ninth pin inclusive.

In every order but the unit there is an additional bank of bell crank levers, ten in each order corresponding in arrangement to the 1 key bank, for effecting' a carry,

from the next lower order, the abutments in the carrying bank being pushed forward by similar universal feet which instead of be` ing controlled by a key, are operated by a eam under control of a spring which is wound up by depression of the keys in the next lower order; and in going from 9 to O in a lower order, this spring is released and an additional 1 added into the higher order. It is to be understood that the selector `bars of each order merely substitute one number at the sight for another. but depressing the keys winds up a spring in the next higher order a number of steps corresponding to the value of the key depressed; and as before stated, when going from 9 to 0 in any 0rder, tripping mechanism will be released,v and the spring unwound to add the necessary 1.

Referring to the drawings, Figure 1 isa sectional right side elevation with the spacingl plates broken away to show the numeral bars of the first or units order, the selector mechanism of the tens order, and the zeroizing key.

Fig. 2 is a fragmentary detail view to more clearly illustrate the operation of the registering plate and the key locking plate.

Fig. 3 isa sectional side elevation of the last order showing the 9 key depressed with its selector bar forward and the numeral bar 9 at the sight.

Fig. LLis a diagrammatic view illustrating the action of the keystems and bell cranks on the spring winding plates and key locking plates.

Fig. 5 is a vertical section on the line 5-5 of Fig. 1 with parts broken away to illustrate the connection between the spring winding mechanism and the carrying cam, and also shows the absence of the carrying bank of bell crank levers from the units order.

Fig. 6 is a sectional plan view of the units, tens and hundreds order of the carrying mechanism.

Fig. 'T is a detail sectional side elevation of the. carrying mechanism illustrated in Fig.'6 and showing the parts in normal position.

Fig. 8 is a horizontal section on the line 88 of Fig. 1 in bottom plan view.

Fig. 9 is a similar View on the line 9 9 0f Fig. 1.

Fig. 10 is a similar view on the line 10-10 et' Fig. 1.

Fig. l1 is a similar view on the line 11.-11 of Fig. 1.

Fig. 12 isa similar view on the line 12-12 of Fig. 1.

Fig. 13 is a similar View on the line 13--13 of Fig. 1.

Fig. 14 is a detail View of the carrying mechanism just ai the point of effecting a carry in going from Si lo (l showing the carrying spring almost at the point of completing a carry, the cscapement mechanism not haring been returned to vlocking position.

Fig. l5 is a detail View showing the action of the carrying and trip pawls on the escapement and carrying cams and the trip lever.

Fig. 16 is a detail vertical section on the line 11i-1U ot' Fig. 1, showing the yoke members t'or operating the universal feet, and illustrating the absence ot' spring winding plate in the highest order, as in this order it is not necessary tov lwind up the springs ot' the next higher order and the key locking plate acts in this instance in the same capacity, in addition to holding' up a` carry when the 9 key is depressed.

Fig. 1,7 is a detail view showing the arrangement of the number plates, one above the other, opened out in fan like arrangement.

Fig. 18 is a detail perspective View of one of the actuating bell crank levers and keystems with the attached roller for oper v ating the yoke arms.

Fig. 19 is a detail perspective view showing the pin on the O4 bar "to operate its bell crank and lift the abutment on the 4 bar.

Fig. 20 is a detail perspective view showing the pin on the 6 har engaging a bell crank which controls an abutment on the 0 bar so that when the 6 bar is moved forward, the abutment is raised into the path of the 4.- keyfoot to add 4 and show 0.

Fig. 21 is a fragmentary perspective view of a modification of registering means which omit the levers.

Fig. 22 is a fragmentary perspective View of one group of selector bars 0r plates and a set or series of controlling devices, the plates themselves being broken away to better disclose these devices.

Referring to the drawings, 10 indicates the numeral keys of which there are nine in each order but the highest which has only the 9 key for adding the extra 9 in the last order to indicate the eorrectan'iount at the sight when subtracting. The numeral keys are pivotally connected to bell crank levers 11 pivoted on cross shaffts 12 supported in the spacing plates. The free ends of bell cranks 11 have offset legs 11B which engage the sides 14" and 15, Fig. 4, of cut out portions of the registering plate 14 and key locking plate 15 respectively, both of which are slotted at 14^ and 15A respectively to permit rearward movement of same on spacing hub 11A when the keys are depressed against the tension of restoring springs 13. As shown in Fig. 4, when a key is depressed, an offset lug 1()A on the keystem rides down alongside the incline spaces 14 and 15C of plates 14- and 15 to prevent overthrow of the same. and also acts to prevent depression of a Asecond key in the saine bank, for as soon as one key has started down, moving of the key locking plate 15 rearward, brings the top of said plates into the path of stud 10A of all keys but the one depressed.' Plate 15 al ways moves its full limit rearward by being acted upon by the offset legs 11B when any key is depressed, but the spring winding plate 14 moves its full limit only when the 9 key is depressed. As shown in the top half of Fig. 4, there is lost motion between the legs 1lB and front faces 14B 4of the registering plates, of an amount corresponding to the difference between value of the key depressed and 9. The plate 14 is connected at its -forward end by a link 16 to a stud 17A on the upper end of full stroke lever 17,

andat'the rear, to one leg of a bell crank `hung from the cross shaft 37 supported in the spacing plates 21.

.i Arranged in vertical alinement beneath the plates 14 and 15 of each order are ten selector plates or bars 22 from O to 9 inclusive which co-act upon the depression of keys to substitute one number for another at the sight. y These plates are supported at their front ends by links 23 hung from a cross shaft 24A and at the rear by the lower armsA of numeral levers 24 pivoted on cross 'shaft 25 supported in the spacing plates and numbered from O to 9 inclusive beginning with 0 at the left, looking from the front. The upper ends of levers 24: form offset plates or tablets each'having a num ber from 0 to 9, the 0 plate being on the bottom and 9 on top-Fig. 17. There is always, one selector plate locked forward in advance of the others by a universal spring controlled dog 26 mounted on a cross shaft 27, the forward end of which is normally held in the path of a stop lug 28 on the lower edge of whichever bar 22 is advanced to prevent the return of same under tension 4of a spring 29 which connects the extensions 22D on the plates-22 with cross shaft 30, the extensions being alternately staggered for convenience in assembling the springs.

Arranged on the side of each plate 22 in all orders but the units and the highest order, there are ten pins 22A, nine controlled by the keys, and one for carrying from a lower order, they plates of the units order each having only nine pins, as there is no carry into the units order, and the plates or bars of the highest order requiring but two abutment pins. These pins engage slots 31A in the upstanding legs of bell crank levers 31 mounted on cross shafts 32 supported in the spacing plates beneath the selector bars 22, the other leg of the bell crank ending in .a socket ywhich holds an upwardly extend ing rod 33 mounted .to slide up and down in guides on the side of whichever selector bar 22 is controlled by the pin and slot connection of the bell crank lever 31, the bell crank levers of the highest tier of shafts 32 being bent to straddle the gap between the selector bar operating the slotted end of bell crank 31, and the selector bar to which the associated rod 33 is attached, and the bell crankson all the lower tiers being of yoke shaped construction for convenience in assembling, as shown in Figs. 8 to 13 in*l elusive.

As'shown in Fig. 1, and more graphically carry never takes in Fig. 22, the farthest selector bar t0 the left or the O bar, is shown in the forward or advanced position, all the remaining bars being in retracted position., the 0A bar being locked forward by the universal dog 26. i The 0 bar being forward, the first nine pins on said bar operate the slotted ends of the bell crank levers 31 forward and lift the other ends to raise the upper ends of the rods 33 above the top of the selector bars from 1 to 9 inclusive. is, the O bar being forward, the first pin on the 0 bar raises the first rod 33 on the 1 bar t0 be operated by the 1 key. The second pin on the 0 bar raises the rod 33 on the 2 bar. The third pin on the O bar raises rod 33 on 3 bar, etc. The 9 pin on the 0 bar raises the rod 33 on the 9 bar to be engaged by depression of the 9 key. As an example, the 0 bar being forward, the 1 key is depressed,

ward, depression of the 2 key would have pushed the 2 bar forward, the 3 key the 3 bar, and so on to 9. The 1 bar or any other bar moving forward, rocks the dog 26 by its cam 28 in moving'forward, and releases the bar 22 which had previously been advanced and permits same to return to retracted position under tension of a 'spring 29, and the bar which had later been moved forward is locked in. the forward position by the front end of pawl 26 engaging back of the cam 28. This forward and rearward movement of the bar 22 rocks its numeral lever 24 about the pivot 25, so that the bar which has been pushed forward substitutes a numeral at the sight corresponding to the bar which has moved forward. and reti-acts the numeral which had previously been at the sight. In all the orders but units there is an additional bank of bell crank levers 31 which are used for effecting a carry from the lower orders, this bank of bell crank levers being identical in arrangement with the bank of bell cranks operated by the 1 key, so that operation of the carry control from a lower order to a higher order substitutes a numeral at the'sight one number higher than that previously appearing.

The last or highest order differs from the lower orders in that all the keys but the 9 key are omitted, the 9 key being only used for adding an additional 9 when performing subtraction to cause the proper numeral to appear at the sight when performing subtraction by the complemental process which is well known in the art of adding machines. ln the units bank. as before stated, the carrying bank of bell cranks is omitted, as a v place' from a lower order to the units order.

1n order to push the selector bars 22 forward to change the numerals atthe sight,

That

and a pawl 35 on a yoke shaped member 36 is operated to engage the'upper end of the rod 33 o'n the 1 bar and push the 1 bar forthe keystem pins are provided with roller studs -10B which engage cam slots 36A in yoke shaped arms 36 pivoted on cross shaft 37. Depression of a key 10 causes these roller studs 10B to rock the yoke shaped levers forward to bring pawl 35 mounted between the side arms of the yoke 36, into Contact with the projecting tops of the rods 33 to push the associated selector rod 22 forward tol its advanced position with its number at the sight and allow the previously advanced selector rod to return to its retracted position, the pawls 35 being flexibly mounted by a spring connection 38, so that when the depressed key is being restored, the forward end of the foot35 will ride over the top of the projecting rod 33 which is in its path, it being understood that there is always one rod 33 projecting above the top of the selector bar for each numeral key in a bank. To safeguard against a key being only partly depressed and insure of its belng'depressed the full limit, a full stroke mechanism is arranged in each order consisting of the lever 17 pivoted on the shaft .40 and having at the lower edge a ratchet segment 39A engaged by a spring pressed double acting pawl 41 which is acted upon in such a way by pins 39C and 39D- on the lever 17 as to insure of the segment traveling its full limit in either direction between the stops 42 and 42". A spring 43 tends to return the key locking bar 15 to its initial position after depression of a key, the forward end of the said key locking bar heilig connected to a stud on the upper end of the lever 17, the registering lever 14 being returned to normal position under tension of a spring 44 which acts on the carryinggear segment 18 to which the rear end of the registering plate 14 is pivoted.

@awa/inf] mr'cLrLfmlsm.-As before stated, forward movement of the selector' bars 22 substitutes one numeral for another at the sight; and when the sum of a series of additions in any one order exceeds 9, the carrying mechanism is brought into p lay in all orders but the units order, as follows:

Beginning with the unitsl order, when a key is depressed, a bell crank lever 11 moves a plate 14 rearward to rock a yoke shaped spring returned segmental rack 18 about the shaft 47, and at the. same time, one of the pawls pushes forward the selector bar whose, rod is in the path of said foot, to substitute a number at the sigh-t in-the units order eorrespomling to the sum of the additions in that order. The forwardly extending leg of gear segment 18 is offset to the left to project throu'gh a slotted opening 48 in the spacing plate and mesh with the gear segment 49 loosely mounted on a cross shaft 50 supported in the spacing plates. 0n depressing a lfey the segment 49 is rotated an amount corresponding to the value of the key depressed, and the dog 51 held in engagement with the gear 52 b y a spring 53,

`an adjacent plate 56 fast on the hub 57A of a 10-tooth carrying gear 57 which is normally held from rotating in a 'counter clockwise direction by one leg58A of an escapernent pawl 58, Fig. 15, loose on shaft 59, which leg engages one tooth of a 4-tooth ratchet 60 fast on hub 57A to restrain movement of same until one of four trip cams 61^ on the periphery of a circular disk 61 engages the nose 62A of an arm 62 fast on the escapement hub, and rocks the escapement arm 58A out ot' engagement with the ratchet 60 and moves the other leg 58B inward inthe path of oneof four cams 63^ on the periphery of a carrying disk 63 fast on said hub 57A. The free end of spring 54 being released, the disk 56, ratchet 6() and cam disk 63 move in a counter clockwise direction a quarter revolution, when the escapement pawl 58^ will have been moved into the path of the next following tooth by the leg 58B being moved outward on the periphery of cam 63K The nose 62A will now have assumed the Fig. 15 position back of the cam 61A or the O position, while a cam 63A in its quarter revolution willhave acted on a roller stud 64 on one leg of a yoke shaped carrying lever 65 pivoted on the cross shaft 66 to push its pawl 67 forward, and consequently the selector bar22 whose upstanding rod 33 is in the path of said foot to substitute a numeral at the sight in the tens order, one unit higher than that previously showing.

The parts 56, 63, and 60 of the tens order being fast on hub 57A of the 10-tooth carrying gear 57 impart a corresponding rotation to said gear 'which is in mesh with a 50- tooth gear 68 in the hundreds order to rotate gear 68 Q10- of a revolution in the direction of the arrow, F ig. 7. A spring pressed pawl 69 fast onthe side of gear 68 engages ay 20-tooth ratchet. 70 fast on the hub of a 20-tooth gear 71, meshing with the 40- tootn gear 52 of the same order and ad-v vances same with the cam disk 61 fastened thereto, a one-step movement at the same time winding up the sprlng a corresponding.

nar/acca placed in the machine in a suiciently wound condition so that the tendency of the spring in th-e hundreds order to rotate the gear 68 in a reverse or counter clockwise direction is overcome by the spring in the tens order. In other words, the gear 68 of the hundreds order is held from counter clockwise movement by the spring` of the tens order, while the spring of the tens order is prevented from unwinding by the pawl 69 of the tens order. Again, if a carry were intended to take place from the tens order to the hundreds order, the spring in the tens order would befstill further wound, and the tendency to unwind from the hundreds order would be overcome by the greater leverage oi' the carrying gear 57 to turn the gear 68, overcoming the leverage of the larger gear 68 to turn the smaller gear 57, irrespective of the amount the spring` of the higher order had been wound up.

To avoid interference with the sequence of operations, it is necessary to provide means for holding up a carry until a numeral key has beenpfully depressed, otherwise a pawl 35 of the numeral key and pawl 67 of the carrying yoke would both tend to operate at the same time, and would result in an erroneous registration and push forward two selector bars. To avoid this, a disk 80 is fastened on the hub 57A of the carrying gear 57 between the disk 56 and the carrying disk 63, said disk 8() having a flanged periphery with cut-out portions 80A, positioned 90 degrees apart, one of these cut-out portions of the flange being normally in horizontal alinement with an offset lug 15D of the key locking plate 15 and immediately adjacent thereto. To prevent interference of the registering and carrying mechanism, the initial downward movement of the keys moves the plate 15 rearward with .its offset lug 15D into one of the cut-out portions 80A to block rotation of the disk 80and the associated carryingmechanism until the key has been fully depressed and a selector bar pushed forward, and with the previously advanced selector bar returned to retracted position, 'which return movement ofthe previously advanced bar restores the rod 33 on the bar last advanced to lowered position, this by the action of the pin 22A returning the slotted end of the bell crank lever 81 to normal position with the upper edge of its associated lever lowered out of engagement with its operating foot 35.

When a key has been fully depressed, the lug 15D will have moved beyond locking engagement with the disk 80, and taken a posi-4 tion shown in Fig. 14 back of the flange to release disk 80 and permit a carry to the next higher order.

A clearer understanding ot the operation of the machine may be had by describing a specific example; as for instance, to add 971 to 785, the 7 selector plate of the hunl dreds order, the 8 plate of the tens order, and 5 plate of the units order would be forward with their corresponding numbers appearing at the sight. Pins 22A on the 7 plate rock the associated slotted arms of the bell cranks 3l to litt the first abutment 33 on the 8 plate into the path of the l key, the second abutment on the 9 plate into the path of the 2 key, the third abutment on the O plate into the path of the 3 key, the fourth abutment on the l plate into the path of the 4 key, the lifth abutment on the 2 plate into the path of the 5 key, the sixth abutment on the third plate into the path of the 6 key, the sevlenth abutment on the fourth plate into the path of the 7 key, the eighth abnutment on the lifth plate into the path ot the 8 key, the ninth abutment on the sixth plate into the path of the 9 key, and the tenth or carrying abutment onthe eighth plate into the path of the carrying pawl 67. The 8 selector plate of the tens order being forward, the pins QQAon that plate would rock` the slotted arms of the associated bell crank levers to lift the first abutment on the 9 plate into the path of the l key, the second abutment on the 0 plate into the path of the 2 key, the third abutment on the 1 plate into the -path of the 3 key, the fourth abutment on the 2 plate into the path of the 4 key, the fth abutment on the 3 plate into the path of the 5 key, the sixth abutmenton the 4 plate into the path of the 6 key, the seventh abutment on the 5 plate into the path of the 7 key, the4 eighth abutment on the6plate into the path of the 8 key, the ninth abutment on the 7 plate into the path of the .9 key, and the tenth or carrying abutment on the 8 plate into the path of the pawl 67. The plate 5 of ,the units order being forward, the pins 22A on that, plate rock the slotted arms ot' the bell cranks 3l to lift the first abutment on the 6 plate into the path of the l key, the second abutment on the 7 plate into the path ot' the 2 key, the third abutment on the 8 plate into the path ot' the il key, the Jfourth abutment on the 5) plate into the path of the 4 key, the fifth abutment on the 0 plate into the path of the 5 key, the sixth abutment on the l plate into the path ot the 6 key, the seventh abutment on the 2 plate into the path of the 7 key, the eighth abutment on the 3 plate into the path of the 8 key, the ninth abutment on the 4 plate into the path of lthe 9 key. There are no carrying abutments associated with the units bank, as no carry takes place into the units order.

At this time the carrying spring 54 of the tens order will have been wound up tive'.

thousands order seven points, as depression ofkeys in any order winds up the spring' of the next higher order a number of points corresponding to the value of the key depressed. The total number of points said spring is wound corresponds to the value of the plate which is forward in the next lower order, or the number at the sight in that order. 4

To add 971, depression of the l -key 10 in the units order rocks its bell crank 11 about its shaft 12 to bring the offset lug 11B into' contact with' the front face 14B of plate 14 to move said plate rearward one step and rock the gear segment 18 meshing with the segment 49 of the tens order to wind up the spring of that order one additional point by the pawl 51 and gear 52, it being understood that the inner end of spring 54 is fastened to the hub 52A of gear 52, and turns therewith while the free end of the spring 54 is locked against rotation by the esca ementpawl 58A engaging the tooth of the isk 60 of which the disk 56 to which the free end of the spring is fastened, is an integral art. Simultaneously with the depression o the 1 key, its roller stud 10B moves downward in the cam slot 36A of the yoke shaped pawl carrying arm 36, and moves the associated pawl 35 forward to engage the first abutment on the 6 selector plate and advance said plate to its forward position and substitute 6 at the sight for 5 previously shown. On the forward movement of the 6 plate its cam 28 rocked the universal latch 27 to release the 5 plate which returned to retracted position under tension of its spring 29, and the point of the pawl 27 returned under spring tension to a position back of cam 28 of the 6 plate to lock vsame forward.

Depressing the 7 key -of the tens order operates a similar set of connections and rocks its pawl 35 forward which engages the seventh abutment 33 on the 5 plate to move it forward and permit the 8 plate previously forward to return to retracted position,` thus substituting 5 at the sight in the tens order. As the carryingspring in the hundreds order was previously wound up eight points, adding seven in the tens order winds up the spring i'n the hundreds 'order an additional seven points, but ten vpoints is the maximum any spring-'may be wound` consequently when the lift cams 61A of disk 61 of the hundreds order are being advanced from the 9 to the 0 position by the winding of thespring, said cam 61A lifts the arm 62 to free the escapement pawl l58A from engagement with escapenlent disk 60 and permit the free end of spring 54 to unwind a quarter revolution in a counter clockwise directionuntil again retarded by the escapement pawl 58A which has been restored to engaging position by the leg 58B being rocked outward radially by a cam 63* of disk 63 in the counter clockwise movement.

When the ratchet 60 was released by the escapement pawl 58A, counter clockwise 'movement was imparted to the carrying gear 57 which extends into the thousands order .and is integral with the ratchet 60 said gear rotating the loose gear 68 of the thousands order sutliciently to cause theI This was ing abutment 33 on the 8\plate of the hundreds order, and advance said plate to its forward position, the 7 plate returning to retracted position, as before described, 856 now appears at the sight, the sum of 785 and 71 being 856.

In a similar sequence of operations, depression of the 9 key in the hundreds order causes its pawl 35 to engage the ninth abutment 33 on the 7 plate to substitute it for the 8 plate previously forwarded, and at the same time, a carry is effected into the thousands order by the carrying pawl 67 engaging the tenth or carrying abutment 33 on l plate of the thousands order to advance same and retract the 0 plate and show 1756 at the sight, the sum 0f 785 and 971.

The above example illustrates the addiat a time beginning with the units order,

but should an operator depress all the keys at one time, the keys of the higher orders would hold up the carry until 'the keys were fully depressed in order to substitute one plate for another before the carrying-operation takes place, thus preventingan erroneous registration.

Zeroz'zing mechanism- To restore all the orders to zero, at the front left side of the machine between the last spacing plate'and the machine cover, such key being limited in movement by a pin and slot connection 82, and restored to normal raised position by a spring 83 connected to an olfset leg 81A of the keystem 81. The lower end of keystem 81 is pivoted to one leg of a bell crank lever 84 fast on a .cross shaft 85, having fast lthereto a lever 86 connected by a link 8f' to a depending lilik 88 secured* a special key 81 is provi-.led

Also

will be seen that depression of the key 81 will draw the links 88 forwardtto engage links 23 of the Oselector bars and pull same i'orward to substitute O at the sight in place ot the previouslyappearing numbers.

The carrying mechanism must also be restored to Zero position with the springs unwound, and to accomplish this, the upstanding arm of the bell crank 84 is connected by a link 87A to the lower end of a rocker arm 92 pinned to the cross shaft 89 and having a boss midway of itslength embracing the shaft 72. Depression of the zeroizing key 81 rocks the shaft 72 rearward in the slots 90 of the spacing plates, to unmesh the gears on shaft 72 from the gears on shaft 50 and permit reverse movement of said gears to` urwind the springs and eliminate any stored up carry which may be in same, thus bringing all the mechanism to normal zero position. To release the pawls 51 from gears 52, there are disposed along the shafts 89 and 72 `rocking bell crank levers 91 having oi'set lugs 91A, which, when levers 91 are rocked with the shaft 72, engage rearwardly extending projections of the pawls 51 to rock same out of engagement with the gears 52. A spring 92A connected to an offset leg of rock arm 92, assists the spring 83 to re turn lever 81 and restore the gears on shaft 72 to meshingr engagement with vthe gears of shaft 50.

overthrow of the carrying mechanism past zero position is preventedby the trip cams 61A onp disks 6() which may have been -partly advanced, being limited in their reverse movement by the inner shoulder of noses l62A of triplevers G2 shown in Fig. 15. To hold gears Lzmd associated parts in alineinent when il oved out of mesh with the gears on shaft'50 in zeroizing, plates 100 are provided on the shaft 101 to engage the 'teeth of gears 71 and hold same in alinement when moved out of mesh with the gears 52.

There being no carry to hold up in the units order, the rear extension of the key locking bar 15 having the-.lug 15D as in the higher orders, is omitted as shown in Fig. 6.

A modi-fied form of my invention is shown in Fig. 21 wherein the numbered tablets are formed integral with the rear ends of the selector plates 22 which have upwardly extending arms 22C bent at their upper ends at'right angles to form tablets arranged in vertical alinement one above the other and numbered from O to 9, the 0 tablet being the lowest one of the. tier.

The operation of the selector plates is the same as previously described with the excaption that the tablets are integral with the selector plates instead of on the oscillating levers 24, and as before stated, one of the bank of selector plates is always in its forward position to expose its number at the vmeans for setting abutments of one plate by operating of a different plate, and key-operatedmembers common to abutments of such plates.

3. In a machine of the class described, the combination ot a set of keys, a tablet for each key, a. group of tablet levers, movable.

plates coupled to said levers respectively and each carrying settable abutments, means for setting abutments of one plate by operation of a different plate, and key-operated members common to abutments of such plates.

4. In a machine ot the class described, the combination of a set of keys, a tablet tor each key, a group of tablet-operating plates each carrying settable abutments, means for setting abutments of oneplate by operation of adifi'erent plate, and key-operated pawls common to abutments of such plates.

5. In a machine of the class described, the combination of a set of keys, a tablet for each key, a group of tablet-operating plates each carrying settable abutments, bell-cranks coupled to the abutments and to the plates and grouped for the setting of abutments on other plates by the movement of an individual plate, and key-operated membersj common to the group of plates.

6. In a machine otf the class described, the combination of a set of keys, a tablet for each key, a group of tablet-operating plates each carrying settable abutments, nested bell crank yokes coupled to the abutments and to the plates and variously offset and grouped for the setting of abutments on other plates by the movement of individual plates, and key-operated members common to the group group,'key-operated 11101111s 0111111111111 111 1111111- ments ot' 11111'01'0111 p1111es, 111111111011111 11bu1.-

11101'1t-enguging means Jf'or 11 higher 011101 group 111' plates` 111111 111011115 0111111011011 by lower 01'1101' keys for operating s11111 1111101' means.

S). 111111 111110111110 of the class described, 1110 I01111111in111i1111 111 sets ot keys, 11 1.1111101 'for 011011 key 111 0111111 set; 11 group of t1111101-op0rating p111t0s 1'111l 011011 set of keys, 011011 1111110 cari-)111g s011111110 1111111111011ts, 111011115 for setting 1111111111011ts ot different plates ot 011e group by operation o1 another plate ot that group. key-111101111011 111011115 001111111111 to abut- 1110111s o1 11111'01'0111 |11111es, 111111111011111 abut- 111e11t-011g11gi11g means for 11 higher order group o1l p11110s, spring-motor means for opr111111g s11111 1111101' means, 11nd winding 111111 0s0111p01110nt devices operaied by the lower order keys.

10. In 11 111110l1in0 of the class described, the combination of sets of keys, 1111111101 for each key of 011011 set, 11 group of tablet-operating 111ernb0rs Afor each set of keys, permut11ti11g meuns associated \vi111 the keys of 011011 set 111111 the associated tablet-operating 111011ns whereby successive operation of keys 11'111 register the sum of their velues, 111111 'means Jfor collectively actuating tablet-opel'- 11t1ng 11101111s of 1110 sere-111 groups to exhibit 0ipher-t11blets. I

11. In 11 machine of the. 0111ss described, the combination ot sets o1 keys` 11 tablet for 011011 key of 011011 set, 11 group 111' tablet-oper 111i11g111e111bers ot 011011 set of keys, permutating means associated with the keys of 011011 set 11nd 1111 associated tablet-operating means 1111e10by 11 successive operation ot keys will register the sum of their values,- spring-niotor carrying means wound by louer order key connections 11nd adapted to 1101111110 tablet-operating members of higher orders, eseapement devices controlling said 111e11ns 11nd controlled by the key connections, 11nd means for collectively actuating tabletoper11ting members of the several groups to exhibit cipher tablets, together with provisions t'or releasing 111e spring-motor means.

JOHN BRICKEN. lVitnesses R. A. MELEIT, J. A. BROPHI. 

